Shoestring fastener



FIG. 1 is a front elevational view of a shoestring fastener, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front, bottom and right side perspective view thereof; and,

FIG. 8 is a rear, top and right side perspective view thereof. 

CLAIM The ornamental design for a shoestring fastener, as shown and described. 